Am 19.01.2011 21:03, schrieb Ron Garret:
I am working on a spam filter. I want both incoming and outgoing messages to go through
the filter, not because the outgoing messages need to be filtered, but because I want the
filter to know who my authorized users have sent messages to because that is a very
reliable indicator of non-spam. My setup requires users to authenticate, so postfix knows
who they are. My question is: is there a reliable way to pass this information to a
filter? I can't find anything about this in the documentation. Reverse engineering
indicates that postfix puts an "Authenticated sender" note in the received-from
header, but that can be forged. Is there a reliable way for a filter to tell if a
message is from an authenticated user?
Thanks,
rg
Yes, spamassassin+amavisd-new.
spamassassin recognizes the authentication header put there by postfix.
There's plenty of documentation around how to do this kind of setup.
John
